In addition to the 14 games released as part of the main (numbered) series and their many spin-offs and related titles, the Final Fantasy series has spawned many works in other media including anime, movies, novels and manga, and radio dramas. Final Fantasy: Unlimited, originally a stand-alone anime series, now has its own sub-franchise which includes video games. Many games, particularly the main series, have soundtrack album releases featuring their music in different arrangements. Square Enix has also consistently released companion books for its games which provide additional backstory and plot information, as well as detailed walkthroughs for the game. Since the announcement of Compilation of Final Fantasy VII, Square Enix has focused on "polymorphic content", expanding each game world with material on many video game platforms, as well as other forms of media.[3]

A large number of spin-off video games have also been made for the Final Fantasy series. These spin-off games vary in their relation to the main series; the first, The Final Fantasy Legend games, were marketed as related in North America but were considered to be the first three games of the SaGa series in their native Japan, and later SaGa games released outside of Japan bear no Final Fantasy branding.[7]Dissidia Final Fantasy, on the other hand, is a fighting game using characters from the main series exclusively.[8] Overall, more than 30 games have been released as spin-offs of the main Final Fantasy series, many within their own sub-series.

Last Order: Final Fantasy VII, a traditionally animated OVA by Madhouse Studios that serves as a prequel to Final Fantasy VII, is included as a bonus feature on the North American Limited Edition Collector's Set of Advent Children[85]

The primary composer of music for the main series was Nobuo Uematsu, who single-handedly composed the soundtracks for the first nine games, as well as directed the production of many of the albums. Music for the spin-off series and main series games beginning with Final Fantasy X was created by a variety of composers including Masashi Hamauzu, Naoshi Mizuta, Hitoshi Sakimoto, and Kumi Tanioka, as well as many others.[2] In addition to the original soundtracks, listed below, many games have inspired orchestral, vocal, or piano arrangement albums, as well as compilation albums featuring music from several Final Fantasy games.

Starting with Final Fantasy III, Square began publishing guide books for its games which traditionally include additional content such as developer interviews and expanded plot and setting information. Studio BentStuff wrote the first Ultimania book for Final Fantasy VIII in 1999, though the company had been contracted to write Final Fantasy VII True Script Dissection for the previous game. Since then, Ultimania books have been written for every major Final Fantasy title, including Battle Ultimania, Scenario Ultimania, and Ultimania Omega editions for some games.[105] Square experimented with online content delivery with Final Fantasy IX Online Ultimania, but the move was criticized for forcing customers to buy a print guide while releasing most of the information online.[106] Another online Ultimania was planned for Final Fantasy XI, but it was dropped during development.[107] Square Enix has produced expanded editions to some books, such as Final Fantasy VII 10th Anniversary Ultimania Revised Edition.[108] In addition to the Ultimania series, Square Enix also publishes an Official Complete Guide series of guide books.[109]

Many Final Fantasy games have been adapted as novels and manga series. With the advent of the Internet, web novels and digital publishing have also become common. These stories act as companion pieces, offering an interpretation of the game's events or expanding the plot of the games by depicting additional scenarios.

Collection of two novellas, "Case of Denzel" and "Case of Tifa", set in Final Fantasy VII's continuity, written by Kazushige Nojima and published in the book Final Fantasy VII: Advent Children Prologue

Released in English in the Advent Children Limited Edition Collector's Set along with "Case of Barret" written specifically for that release

Four more stories, "Case of Yuffie", "Case of Red XIII", "Case of Shinra", and "Case of the Lifestream", and the previous three were published in a single anthology in Japan by Square Enix, on April 16, 2009[121]